fix typo in do_pause() log output

Merging awesomeness

Getting the print queue api working with the printer, adding a job progress panel to inspector and adding job_finished and job_started events.

Throttling the DOM writes of pronserve inspector and stopping dom writes entirely when the window looses focus.

Adding a sleep to the pronserve startup. Seems to be fixing an intermittent bug where the printer wouldn't respond to temperature requests

Refactoring Pronsole to wrap print in a self.log method so that it can be reused and overriden by a web interface or any other non-conosole interface

Recovery after pause

implemented the @pause gcode host command (and a small framework for host commands)

Pause code (Ported from RepetierHost, untested)

Fix crash on SUSE when setting temperature due to setting temp field background color to "".

This replaces "" strings that cause aborts in python-wxWidgets wxColour_helper with
Python None objects. This corrects an abort where the helper tries to fetch the
first byte of the colour string even when it's 0 length.